<div class="left" id="nav">
    <ul>
        <li class="user active" onclick="cutoverNav(this,'all')"><a href="javascript:;">Z</a></li>
        <li class="message" onclick="cutoverNav(this,'list')">
            <div class="ide"></div>
            <a href="javascript:;"></a>
        </li>
        <li class="contacts" onclick="cutoverNav(this,'list2')">
            <div class="ide"></div>
            <a href="javascript:;"></a>
        </li>
    </ul>
    <div class="foot" onclick="cutoverAdd()">+</div>
    <div class="float hidden" id="addnav">
        <div class="triangle"></div>
        <a href="javascript:;" onclick="addfriend('group')">创建群聊</a>
        <a href="javascript:;" onclick="addfriend('friend')">添加好友</a>
    </div>
</div>